Fascinating Astro Disk, the perfect star enthusiast's companion. Become a star gazer if you aren't already! The flat Astro Disk-celestial circle is an informative guide to the stars and constellations. The working model of the heavens includes a detailed star disk and overlay horizon disk, allowing you to view the nighttime sky at any time of night, any night of the year, simply by matching the time and date on the two disks. This amazing celestial Astro Disk comes in a 9" and 13" diameter model, and sits atop a clear stand. There is also an instructional sheet so you can be a beginner OR an expert. It's educational for all.